2 Answers

The reason is the back pannel of your O2 has a switch. Iff you notice just next to the Battery pack you might have a small switch which it wil trigger the device to turn off and on the latch must lock when the pannel is closed. If that switch can be closed by a paper then it wont switch off.

I have also had this problem. After reading the solution posted by mmrajesh2002 I bought an aluminum case for my phone to see if the battery cover was being bumped in my pocket.
Normally my phone would restart several times a day.
So far it has not had the problem since I started using the case three days ago.

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Try to bring your O2 XDA II mini to it's own service center because the problem is in it's program itself or it's memory containing it's program. The service center has their own orignal software utilities for that.

put the foil paper or what ever that can fit the hole in the low right hand side of O2 mini looking from the backthe hole (just right over the red rubber thing named "pull")just put sth that fit the hole and close the lid and thenprevent the lid opening by putting some scotch tape onproblem solvedjust keep the lid close to prevent the thing we put in the hole fall outthat's all(the thing in the hole is to pushing the switch inside the hole)